US2908348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic air filter
Assignee: American Air Filter Co Inc
•
Filing: 1957-11-18
•
Granted: 1959-10-13
•
Expires: 1977-11-18
Abstract
No abstract record available.
Inventors
- 👤 Richard D Rivers
- 👤 Deloss H Robb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:48
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; B03; B03C; B03C3/00; B03C3/34; B03C3/40; B03C3/60; B03C3/86
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |